平面旋轉式LED掃描顯示器的設計

Abstract

對一個大尺寸的全彩LED顯示器，由於高亮度LED的費用昂貴，在本文中，我們提出一個能夠用來減少顯示器中LED用量的設計，在這個設計中，發展出時間與空間的分割機構經由轉動的LED條來分享亮度。根據時間、空間與顯示器上的座標同步地驅動LED條，則可得實用的亮度，並且可以節省可觀的LED用量。 本論文的目的即在分析此可行性而其方法也就是利用人類視覺暫留的原理。在這裡,時間與空間的分割機構或者是平表旋轉機構是用來做一維空間的掃描，產生整體畫面的影像。機構包括兩部份:由馬達帶動皮帶輪，而皮帶依附在皮帶輪上，然後再帶動掛在皮帶上的LED模組產生掃描的效果。在本文中, 為穩定掃描速度我們完成了馬達伺服控制並且產生同步信號，這樣一來，影像信號才能被同步地傳送。

Due to the cost of the high illuminating LED for a large scale full color LED display, In the present thesis, we propose a design that can be used to reduce the total number of LEDs in the display. In this design, the time-spatial sharing mechanism is developed to share the illumination using moving LED bars. By driving the LED bars according to the time-space and coordinate on the LED display synchronously, we not only can get realistic illuminance, but also save the number of LEDs used in the system considerably. The purpose of this thesis is to analyze the feasibility of utilizing the human vision in halting image. Here, the time-spatial sharing mechanism or the flat surface rotating mechanism is developed for one dimensional scanning effect that is used to produce a complete image .The mechanism consists of two parts: a conveyer with LED bar attached on the belt and a driving motor that produce the scanning effect on the LED bars. In this thesis, we have completed the motor servo control for stabilizing the scanning speed and the generation of synchronization signal so that image signal can be transmitted accordingly.